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fix security issue (bsc#1122675) no / in filename

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This checks if the filename of a downloaded file has
been modified (for example by a MITM attack) to contain
slashes. This could mean that the file is compromised
and that the attacker tries to overwrite system files.
This commit is contained in:
lethliel 2020-05-27 09:40:16 +02:00
parent 3967133022
commit a79c54418b
1 changed files with 4 additions and 1 deletions
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5
osc/fetch.py
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@ -179,8 +179,11 @@ class Fetcher:
print('Unsupported file type: ', tmpfile, file=sys.stderr)
sys.exit(1)
canonname = pac_obj.binary
decoded_canonname = decode_it(canonname)
if b'/' in canonname or '/' in decoded_canonname:
raise oscerr.OscIOError(None, 'canonname contains a slash')
fullfilename = os.path.join(destdir, decode_it(canonname))
fullfilename = os.path.join(destdir, decoded_canonname)
if pac_obj is not None:
pac_obj.canonname = canonname
pac_obj.fullfilename = fullfilename